For example : I hope to connect WeMo switches in my home and Office using the same App on the same iPhone. If it is not possible. Could someone suggest a possible solution that doesn't involve getting another iPhone or iPad or iPod.

According to the Belkin website, it cannot. I wanted to do precisely what you wanted to at work and at home.

"Can my WeMo App control WeMo devices in different homes (on multiple networks)?
No, WeMo App cannot control other WeMo devices in different homes. Currently, an Android™ or iOS device can only control WeMo devices in one (1) location. To control WeMo devices in multiple locations, you will need another iOS or Android device for each location."

I tried and it did not work. I do not have another solution at this point, but I'm also looking for one.

OK, just after I submitted the question, I continued to sleuth for an answer. I viewed the image of the switch and there on the plate near the power prongs was the information on amperage or current draw.

So, the answer is 15 amps. Multiplying that number by the voltage provides the number of watts which the switch can handle.

You'd want to find a European version for the right socket geometry. The UK and Australian ones will work with 220V, but the socket type differs. Look around for a local model. Do not buy the USA model.

If you're on your home wifi network, it won't have any impact on your cell data. But, you can turn the device on and off when you're away from the home too of course. Having said that, the 'instruction' to turn on/off the device uses such a tiny amount of data you won't even notice it. An email will use more! Posting a photo or checking a website, again, WAY more. It doesn't matter how long the device is on for, it is only sending the 'instruction' itself which uses any data.

Nest available at Apple.com is awesome! I love it. It's high quality and easy to install with great web browser or app interfaces. Seriously saves you cash also. I bet you'll save the cost of the device in heating and cooling savings. No, I'm not a Nest salesperson :-).

The unit will also learn when you are there or not and adjust the heat/cooling. You can also lock it with a pin or just adjust the temp quickly, remotely.